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Shape memory polyurethanes have been prepared from polycaprolactone diol, 1,6-hexanediol and 4,4′-dicyclohexylmethane diisocyanate. The structural identification of the final polymer was confirmed by Fourier transform infrared spectroscopy. The thermo-mechanical history was studied using thermo-gravimetric analysis, differential scanning calorimetry, dynamic mechanical thermal analysis and shape memory testing by tensile cyclic loading using a temperature controlled chamber. The absence of any peak corresponding to functional groups of monomers confirmed the completion of reaction. The thermo-grams showed a gradual decrease in the thermal transition with increasing crystallinity, with corresponding increase in the molecular weight of macrodiol used as soft segments. The highest value of shape recovery of the sample (PCL, 4 000 g mol −1 ) obtained was 96%, and retention up to 85%.

Synthesis and thermo-mechanical investigation of macrodiol-based shape memory polyurethane elastomers